Show your Wildcats pride with custom Mount Si High School apparel designed for everyday wear and all events. Whether you're cheering on teams like football, basketball, soccer, and cross country, or supporting clubs and programs such as drama, debate, and band, we have you covered with spirit wear that is high-quality and comfortable.
All designs are available across multiple garment types — including t-shirts, sweatshirts, and hoodies — and offered in a variety of colors, styles, and sizes. Every item is made to order, printed with high-quality inks and materials, and proudly produced and shipped right here in the heart of the USA.
Founded in 1945, Mount Si has been a proud part of the community for generations in Snoqualmie, Washington. Wear your custom apparel to show your support at games, events, and around town.
If you're a principal, advisor, coach, PTO/PTA member, booster, or another representative or leader within Mount Si, we'd love to work with you. Through our Store Partnership Program, you can help guide updates to your organization's store — including colors, logos, collections, and products — to better reflect your community.
Store Partners also earn back a portion of every sale made through their store, turning spirit wear into a simple, ongoing source of support for your organization.
Learn more about becoming a Store Partner →